What is a psychrometric chart?
We will provide an easy-to-understand explanation of the psychrometric chart, which is a diagram showing the interrelationships between dry-bulb temperature, relative humidity, absolute humidity, specific enthalpy, etc.
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A "psychrometric chart" is a diagram that compares and contrasts the interrelationships between dry-bulb temperature, relative humidity, absolute humidity, specific enthalpy, and other factors that are difficult to grasp in unsaturated air.
It is also commonly called a "psychrometric chart."
The types of psychrometric charts are explained below.
Types of psychrometric charts
NC diagram
This is a psychrometric chart with dry-bulb temperatures ranging from -10°C to 50°C. This is the most commonly used chart for general industrial air conditioning, such as air conditioning for people.
LC diagram
This is a psychrometric chart used in areas where the dry-bulb temperature is low, which is not possible with an NC chart. The dry-bulb temperature is -40°C to 10°C, and the absolute humidity is 0 to 0.007 kg/kg (DA).
HC diagram
This is a psychrometric chart used in high dry-bulb temperature ranges that cannot be handled by the NC chart. The dry-bulb temperature is 0°C to 120°C, and the absolute humidity is 0 to 0.020 kg/kg (DA).
Specific enthalpy on the psychrometric chart
For example, when the dry bulb temperature is 25°C and the relative humidity is 60%, the specific enthalpy is 55.42 KJ/Kg(DA).
Please use the simple glossary below to help you understand psychrometric charts.
| dry bulb temperature | The air temperature indicated by a dry-bulb thermometer. |
|---|---|
| wet bulb temperature | The air temperature indicated by a wet bulb thermometer. Due to the latent heat of evaporation of water, it indicates a lower temperature than a dry-bulb thermometer. The temperature difference at this time can be used to determine the relative humidity of the air. |
| Relative temperature | It is expressed as water vapor partial pressure/saturated water vapor pressure x 100. Water vapor partial pressure is the pressure of the water vapor contained in moist air, and saturated water vapor pressure is the pressure of the vapor when moist air is saturated. |
| absolute temperature | Weight of water vapor contained in 1 kg of dry air. The unit is kg/kg (DA). |
| Saturated water vapor amount | The maximum amount of water vapor (g) that air at a certain temperature can hold in 1m³ of space. The lower the temperature, the smaller the amount, and the higher the temperature, the larger the amount. |
| sensible heat | When water is heated from 0 to 100°C, the temperature changes only due to the change in heat. This refers to the amount of heat (energy) required to achieve this. |
| latent heat | The amount of heat (energy) required for a substance to change form, such as water⇔ice or water⇔water vapor. |
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Apiste 's many years of know-how and precision air conditioner (TCU/ECU) PAU series will create a constant temperature and humidity environment.
- Temperature stability ±0.1℃
- Humidity stability ±0.5%RH
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